Bundtzen, T.K.Harris, E.E.Gilbert, W.G.1997Geologic Map of the Eastern Half of the McGrath Quadrangle, Alaskamap and vector digital dataReport of InvestigationsRI 97-14AFairbanks, Alaska - USAState of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys34 pp., 1 sheet, scale 1:125,000http://dx.doi.org/10.14509/2549This map is a compilation of previously unpublished and published data, as well as from updated field mapping. This publication offers a 1:125,000-scale map sheet accompanied by a booklet containing a summary of the geology, a colored terrane map, map unit descriptions, a summary table listing selected mineral deposits and energy resources, references, and a correlation of map units. The text (in the report) describes the geology and resource potential of a highly mineralized region centered in the Farewell silver-lead-zinc district southeast of McGrath. Potentially important coal resources flanking the Alaska Range are also described in the map area.This project and resulting report, map and layers are intended to provide a geologic map and a geologic interpretation of the eastern half of the McGrath Quadrangle at 1:125,000 scale. Companies involved in or considering mineral exploration in the McGrath area will find this map useful, as well as persons examining the region's coal resources as a potential fuel for local heat and power development.
The layers listed below are present as ArcGIS shape files. Attribute information for the following layers (entities) is included in this metadata file under the "Entity_and_Attribute_Information" section. Each layer is listed and described in detail under its own heading starting "Entity_Type_Label." Basic unit information is also included in the geologic unit code set file "RI1997-14_codeset.pdf." Layers include:
>mcggeog_arc geologic map unit contacts (arc)
>mcggeog_poly geologic map unit contacts (polygon)
>mcgflt_arc fault location traces and types
>mcgglacial_arc glacial extents
>mcgcline_arc anticline and syncline traces of axial planes
>mcgdike_arc dike locations and probable lengths
>mcgstrsym_point points for the strike, dip, and plunge of bedding planes, foliation, and various lineaments
>mcgstrdip_point point attribute table that displays strike and dip information
>mcgmine_point location of selected mineral deposits and energy resources
1980070119970630June 20, 1997 (publication date)completenone planned-154.628732-152.88384463.02563761.962990ISO 19115 Topic CategorygeoscientificInformationnoneAlluvial DepositsColluvial DepositsEolianGeologic HazardsGeologic MaterialsGeologyGlacial DepositsnoneAlaska, State ofMcGrathnoneDenali-Farewell FaultDillinger TerraneFarewell TerraneKahiltna TerraneMcKinley TerraneMiddle Fork Plutonic ComplexMystic TerranePingston TerranePost River PlutonVeleska Lake Volcanic ComplexYukon-Tanana TerranenoneCambrianCarboniferousCenozoicCretaceousDevonianEarly DevonianEarly JurassicEarly SilurianJurassicLate DevonianLate PermianLate SilurianMesozoicMiddle DevonianOrdovicianPaleozoicPermianProterozoicQuaternarySilurianTertiaryTriassicThis report, map, and/or dataset are available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. User specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys.State of Alaska, Department of Natural Resources, Division of Geological & Geophysical SurveysGIS Data Manager/Cartographermailing and physical3354 College RoadFairbanksAK99709-3707(907) 451-5029(907) 451-5020(907) 451-5050dggspubs@alaska.govYou may view our web site at http://www.dggs.alaska.gov for the latest information on available data. Please e-mail your questions and data requests when possible since our web site and e-mail address will remain current even if our phone number and mailing address change.This map synthesis was partially supported by the U.S. Geological Survey's National Mapping Program under cooperative agreement 1434-HQ-96-AG-01471. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. government. Additional Acknowledgments: Bedrock geology field investigations by T.K. Bundtzen (1980-1984,1988-1989,1993), W.G. Gilbert (1981-1984,1989), E.E. Harris (1988-1989,1993), D.N. Solie (1981-1982,1984,1988-1989), and J.T. Kline (1980-1982,1988-1989). Additional field contributions by M.S. Lockwood(1982-1983), J.G.Clough(1981,1983), T.E. Smith(1982-1983), Kate Bull (1981-1982), K.M. McDonald (1982), Kristin Kline (1981), D.B. Dickey (1981), John Ebel (1982), Larry Lueck (1980), G.M. Laird (1989), Grant Abbot (1989,1993), S.P. Gordey (1989), R.B. Blodgett (1982-1983,1989), D.J. Szumigala (1983), and Carolyn Parker (1983). Surficial geology field investigations by J.T. Kline (1980-1982,1988-89) and T.K. Bundtzen (1981-1984, 1988). Map synthesis and compilation by E.E. Harris and T.K. Bundtzen; Technical review by M.L. Miller and R.A. Combellick; Electronic digital cartography by A.M. McCarthy and G.R.C. Graham; Color design by Ann-Lillian Schell; Editing done by Paula K. Davis.ArcInfo, ArcGIS post-version 7.0, and any text editor.Kline, J.T.Pinney, D.S.1997Derivative Map of the Geologic Materials and Hazards in the Eastern Half McGrath Quadrangle, AlaskamapReport of InvestigationsRI 97-14BFairbanks, AK, USAState of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys1 sheet, scale 1:125,000http://dx.doi.org/10.14509/2550Kline, J.T.Bundtzen, T.K.1986Two Glacial Records from West-Central AlaskaAnchorage, AK, USAGeological Society of Alaskap. 123-150Hamilton, T.D. (ed.)Reed, K.M. (ed.)Thorson, R.M. (ed.)1986Glaciation in Alaska: the Geologic RecordAnchorage, AK, USAGeological Society of AlaskaBundtzen, T.K.Kline, J.T.Clough, J.G.1982Preliminary Geology of McGrath B-2 Quadrangle, AlaskamapAlaska Open-File Report 149AOF 149Fairbanks, AK, USAState of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys25 pp., 1 sheet, scale 1:40,000http://dx.doi.org/10.14509/69Gilbert, W.G.Solie, D.N.Kline, J.T.Dickey, D.B.1990Geologic Map of the McGrath B-3 Quadrangle, AlaskamapProfessional Report 102PR 102Fairbanks, AK, USAState of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys2 sheets, scale 1:63,360http://dx.doi.org/10.14509/2283Bundtzen, T.K.Kline, J.T.Smith, T.E.Albanese, M.D.1987Geologic Map of the McGrath A-2 Quadrangle, AlaskamapProfessional Report 91PR 91Fairbanks, AK, USAState of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys20 pp., 1 sheet, scale 1:63,360http://dx.doi.org/10.14509/2272Gilbert, W.G.Solie, D.N.Kline, J.T.1988Geologic Map of the McGrath A-3 Quadrangle, AlaskamapProfessional Report 92PR 92Fairbanks, AK, USAState of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys2 sheets, scale 1:63,360http://dx.doi.org/10.14509/2273Data for geologic layers was digitized off of a mylar geologic compilation. This compilation was done on a stable mylar of the USGS topographic base for the McGrath Quadrangle, Alaska that was photographically enlarged to 1:125,000. (Topographic base compiled in 1965, revised in 1978, 1980, and 1982.) Geologic data included in the compilation are the field maps and notes from this project as well as data from other sources as noted in the "Sources Cited" section.Polygon topology present and clean on appropriate coverages. Other coverages are line, point, or annotation coverages and do not require topologic relationships. Chain-node topology present.This data set includes coverages that contain information about geologic units, sample locations, structural features, structural measurements, dikes, selected mines, glacial limits, and materials units.Location data were determined visually using topographic maps at scales of 1:63,360 and 1:40,000 scale topographic maps using USGS map bases. Some stations were plotted on 1:63,360 scale Infra-Red and 1:40,000 scale black and white air photos during mapping. Because location information was acquired during the time period 1980-1992, GPS technology was not used to determine locations. Instead, geologic contacts, sample, and station locations were visually hand-plotted onto stable mylar bases from the field maps and in some instances, air photos. The lists of samples were visually checked against the lists of analyzed samples returned from the laboratories.100The estimated horizontal error of this dataset is +/- 100 meters. Geologic map data have a horizontal positional accuracy dependent on the "on-screen" method of digital cartography. Map error is induced by: (1) the nominal scale of the aerial photographs on which it is based, with an estimated potential error due to a pen line width of approximately 0.001 being equivalent to approximately 1.5 meters on the ground; (2) the error produced by suturing and stretching air photos during orthorectification, with measured errors ranging from X-Y meters; (3) the digitizing RMS error, which varies with digitizing session from X-Y meters; and (4) the accuracy of the human operator digitizing the geologic linework from the topographic base maps and orthophoto, with an estimated error due to a pen line width of approximately 0.001 being equivalent to approximately 1.5 meters on the ground.Thommen TM altimeters were frequently used and calibrated daily.6The estimated horizontal error of this dataset is +/- 6 meters, based upon the inherent instrument errors of the Thommen TM altimeter.Kline, J.T.Pinney, D.S.19970620Derivative Map of the Geologic Materials and Hazards in the Eastern Half McGrath Quadrangle, AlaskamapReport of InvestigationsRI 97-14BFairbanks, AK, USAState of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys1 sheet, scale 1:125,000http://dx.doi.org/10.14509/2550125000paper map1980070119970630Published in 1997 based on a compilation of work done in the area from a period of 1981 to 1997Kline and Pinney, 1997See references cited in reports in RI 1997-14A and RI 1997-14BFernald, A.T.1960Geomorphology of the Upper Kuskokwim Region, AlaskamapU.S. Geological Survey Bulletin 1071-GB 1071-GWashington, D.C.United States Government Printing Officep. 191-279, 2 sheets, scale 1:250,000http://www.dggs.alaska.gov/pubs/id/3608250000paper map and report1960Publication dateFernald, 1960The geologic map synthesis has benefited from regional surficial geologic investigations provided in this bulletin.Kline, J.T.Bundtzen, T.K.1986Two Glacial Records from West-Central AlaskamapAnchorage, AK, USAGeological Society of Alaskap. 123-150T.D. Hamilton, eds.K.M. Reed, eds.R.M. Thorson, eds.1986Glaciation in Alaska: the Geologic RecordmapAnchorage, AK, USAGeological Society of Alaskabook1960Publication dateKline and Bundtzen, 1986The geologic map synthesis has benefited from regional surficial geologic investigations provided in this publication.Reed, B.L.Lanphere, M.A.1972Generalized Geologic Map of the Alaska-Aleutian Range Batholith Showing Potassium-Argon Ages of the Plutonic RocksmapU.S. Geological Survey Miscellaneous Field Studies Map 372MF-372Washington, D.C.United States Government Printing Office2 sheets, scale 1:1,000,000http://www.dggs.alaska.gov/pubs/id/131621000000paper map1972Publication dateReed and Lanphere, 1972The geologic map synthesis has benefited from regional geologic mapping provided in this publication.Reed, B.L.Nelson, S.W.1980Geologic Map of the Talkeetna Quadrangle, AlaskamapU.S. Geological Survey Miscellaneous Investigations Map I-1174I-1174Washington, D.C.United States Government Printing Office1 sheet, scale 1:250,000http://www.dggs.alaska.gov/pubs/id/12942250000paper map1980Publication dateReed and Nelson, 1980The geologic map synthesis has benefited from regional geologic mapping provided in this publication.Herreid, G.H.1968Geological and Geochemical Investigations Southwest of Farewell, AlaskamapGeologic ReportGR 26Fairbanks, AK, USAState of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys24 p., 2 sheets, scale 1:72,411http://dx.doi.org/10.14509/35572411paper map1968Publication dateHerreid, 1968The geologic map synthesis has benefited from detailed mapping in the Windy Fork area provided in this publication.Michael Churkin, Jr.Claire Carter1996Stratigraphy, Structure, and Graptolites of an Ordovician and Silurian Sequence in the Terra Cotta Mountains, Alaska Range, AlaskamapU.S. Geological Survey Professional Paper 1555P 1555Washington, D.C.United States Government Printing Office84 p., 4 sheets, scale 1:24,000http://www.dggs.alaska.gov/pubs/id/401824000paper map and report1996Publication dateChurkin and Carter, 1996The geologic map synthesis has benefited from detailed mapping in the Terra Cotta Mountains provided in this publication.The coverages included in this project are digitized from a mylar compilation of geologic field maps produced on USGS topo bases of the area. Map unit (polygon) locations and attributes were checked by three reviewers familiar with the dominant geologic rock types and structures and/or the specific geology of the McGrath quadrangle area. Location data were determined visually using topographic maps at scales of 1:63,360 and 1:40,000 scale topographic maps using USGS map bases. Some stations were plotted on 1:63,360 scale Infra-Red and 1:40,000 scale black and white air photos during mapping. Because location information was acquired during the time period 1980-1992, GPS technology was not used to determine locations. Instead, geologic contacts, sample, and station locations were visually hand-plotted onto stable mylar bases from the field maps and in some instances, air photos.1997Universal Transverse Mercator5N0.999600-153.0000.05000000coordinate pair0.0000010.000001metersmcggeog_arcUniversal Transverse Mercator5N0.999600-153.0000.05000000coordinate pair0.0000010.000001metersmcggeog_polyUniversal Transverse Mercator5N0.999600-153.0000.05000000coordinate pair0.0000010.000001metersmcgflt_arcUniversal Transverse Mercator5N0.999600-153.0000.05000000coordinate pair0.0000010.000001metersmcgglacial_arcUniversal Transverse Mercator5N0.999600-153.0000.05000000coordinate pair0.0000010.000001metersmcgcline_arcUniversal Transverse Mercator5N0.999600-153.0000.05000000coordinate pair0.0000010.000001metersmcgdike_arcUniversal Transverse Mercator5N0.999600-153.0000.05000000coordinate pair0.0000010.000001metersmcgstrdip_pointUniversal Transverse Mercator5N0.999600-153.0000.05000000coordinate pair0.0000010.000001metersmcgstrsym_pointUniversal Transverse Mercator5N0.999600-153.0000.05000000coordinate pair0.0000010.000001metersmcgmine_pointD_Clarke_1866Clarke 18666378206.4294.978698mcggeog_arc.shpObject type is vector, there are 10,322 rows associated with this entity, and the entity values refer to geologic map unit contacts.Alaska Division of Geological & Geophysical Surveysmcggeog_arcCODELine symbol for geologic map unit contactsAlaska Division of Geological & Geophysical Surveys5ContactAlaska Division of Geological & Geophysical SurveysMERGECODEUsed to notate contacts that are faults.Alaska Division of Geological & Geophysical SurveysCContact onlyAlaska Division of Geological & Geophysical SurveysFContact/faultAlaska Division of Geological & Geophysical Surveysmcggeog_poly.shpObject type is vector, there are 3221 rows associated with this entity, and the entity values refer to the unit name abbreviations for each specific polygon represented on the map.Alaska Division of Geological & Geophysical Surveysmcggeog_polyUNITA unique three to four letter abbreviation given to each map unit represented on the map. Any unit ending with a "?" indicates uncertainty.Alaska Division of Geological and Geophysical SurveysRI1997-14_codeset.pdfAlaska Division of Geological & Geophysical Surveys http://www.dggs.alaska.gov/metadata/RI1997-14_codeset.pdfMATA unique three letter abbreviation given to each materials unit represented on the map. Materials units imply a hazards classification.Alaska Division of Geological and Geophysical SurveysRI1997-14_codeset.pdfAlaska Division of Geological & Geophysical Surveys http://www.dggs.alaska.gov/metadata/RI1997-14_codeset.pdfmcgflt_arc.shpObject type is vector, there are 750 rows associated with this entity, and the entity values refer to fault location traces and types.Alaska Division of Geological & Geophysical Surveysmcgflt_arcCODETypes of faults found in the map area.Alaska Division of Geological and Geophysical Surveys11high-angle faultAlaska Division of Geological & Geophysical Surveys12Approximately located faultAlaska Division of Geological & Geophysical Surveys13Fault, inferredAlaska Division of Geological & Geophysical Surveys15Concealed faultAlaska Division of Geological & Geophysical Surveys17Thrust fault, sawteeth on upper plateAlaska Division of Geological & Geophysical Surveys33Lineament, used on small-scale tectonic mapsAlaska Division of Geological & Geophysical SurveysMERGECODEUsed to notate contacts that are faults.Alaska Division of Geological & Geophysical SurveysCContact onlyAlaska Division of Geological & Geophysical SurveysFContact/faultAlaska Division of Geological & Geophysical Surveysmcgglacial_arc.shpObject type is vector, there are 43 rows associated with this entity, and the entity values refer to glacial extents.Alaska Division of Geological & Geophysical Surveysmcgglacial_arcCODEIce limit advances-Increasing roman numerals depict maximum drift limits and numerical superscripts depict stages sequentially from oldest to youngest.Alaska Division of Geological and Geophysical Surveys42Glacial limit I, approximately located, first advance (oldest)Alaska Division of Geological & Geophysical Surveys44Glacial limit II, approximately located, second advanceAlaska Division of Geological & Geophysical Surveys46Glacial limit III, approximately located, third advanceAlaska Division of Geological & Geophysical Surveys48Glacial limit IV, approximately located, fourth advanceAlaska Division of Geological & Geophysical Surveys50Glacial limit V, approximately located, fifth advanceAlaska Division of Geological & Geophysical Surveysmcgcline_arc.shpObject type is vector, there are 319 rows associated with this entity, and the entity values refer to the anticline and syncline traces of axial planes. This coverage must be viewed with mcgstrsym layer to know what type of anticline or syncline is being represented by the arc.Alaska Division of Geological & Geophysical Surveysmcgcline_arcCODEA number representing the anticline or syncline trace.Alaska Division of Geological and Geophysical Surveys34Fold axis anticline or syncline.Alaska Division of Geological & Geophysical Surveys38Anticline or syncline, concealed.Alaska Division of Geological & Geophysical Surveysmcgdike_arc.shpObject type is vector, there are 375 rows associated with this entity, and the entity values refer to dike locations and probable lengths.Alaska Division of Geological & Geophysical Surveysmcgdike_arcCODEOne of four numbers that represent dikes found in this map area.Alaska Division of Geological and Geophysical Surveys54DikesAlaska Division of Geological & Geophysical Surveys55DikesAlaska Division of Geological & Geophysical Surveys56DikesAlaska Division of Geological & Geophysical Surveys57DikesAlaska Division of Geological & Geophysical Surveysmcgstrdip_point.shpObject type is point, there are 656 rows associated with this entity, and the entity values refer to symbols for strike and dip information.Alaska Division of Geological & Geophysical Surveysmcgstrdip_pointDIPRepresents the dip angles used to produce the dip directions.Alaska Division of Geological and Geophysical Surveys090CODERepresents the symbols used to describe the strike and dips of beds, cleavage, joints, and foliation.Alaska Division of Geological and Geophysical Surveys1Strike and direction of dip of beds.Alaska Division of Geological & Geophysical Surveys4Strike and dip of overturned beds.Alaska Division of Geological & Geophysical Surveys5Strike of vertical beds, stratigraphic tops to north.Alaska Division of Geological & Geophysical SurveysX-COORDRepresents the X-coordinates in UTM for each strike and dip location.Alaska Division of Geological and Geophysical Surveys422695.41499879.98metersY-COORDRepresents the Y-coordinates in UTM for each strike and dip location.Alaska Division of Geological and Geophysical Surveys6874551.196952135.66metersmcgstrsym_point.shpObject type is point, there are 202 rows associated with this entity, and the entity values refer to symbols for folds, anticlines, synclines, and bedding features. This coverage must be viewed with mcgcline layer to know the trace of the anticline or syncline.Alaska Division of Geological & Geophysical Surveysmcgstrsym_pointSYMBOLUsed for differentiating structural symbol types.Alaska Division of Geological and Geophysical Surveys22Anticline and trace of axial plane.Alaska Division of Geological & Geophysical Surveys23Syncline and trace of axial plane.Alaska Division of Geological & Geophysical Surveys24Relative horizontal movement along faultAlaska Division of Geological & Geophysical Surveys25Relative horizontal movement along faultAlaska Division of Geological & Geophysical Surveys26overturned syncline, showing direction of dip of limbsAlaska Division of Geological & Geophysical Surveys27Overturned anticline, showing direction of dip of limbsAlaska Division of Geological & Geophysical Surveys39Provides direction of plunge.Alaska Division of Geological & Geophysical Surveysmcgmine_point.shpObject type is point, there are 38 rows associated with this entity, and the entity values refer to symbols for selected metallic mineral deposits and energy resources.Alaska Division of Geological & Geophysical Surveysmcgmine_pointSYMBOLThis attribute represents the location of selected mineral deposits and energy resources.Alaska Division of Geological and Geophysical Surveys143Specific symbol to designate sample locality.Alaska Division of Geological & Geophysical Surveys ESRI Markerset Mineral.mrkMINEEach number represents the sample location number of the selected mineral deposits and energy resources portrayed in Geologic Map of the Eastern Half of the McGrath Quadrangle, Alaska (Sheet 1).Alaska Division of Geological and Geophysical SurveysThese values represent the actual locality numbers given to each selected mineral deposits and energy resources. They coincide with Table 1 ("Name of Deposit") of the report Geologic Map of the Eastern Half of the McGrath Quadrangle, Alaska.State of Alaska, Department of Natural Resources, Division of Geological & Geophysical SurveysNatural Resource Technicianmailing and physical3354 College RoadFairbanksAK99709-3707USA907-451-5020None available.907-451-5050dggspubs@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidaysPlease view our web site (http://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.Report of Investigation 97-14AThe State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products, any failure thereof, or otherwise, and in no event will the State of Alaska's liability to the requester or anyone else exceed the fee paid for the electronic service or product.Current publication is available on paper. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard.Printed publication can be purchased for $17.00 (contact information below) plus shipping if mailed.PDF1.6No compression appliedhttp://dx.doi.org/10.14509/2549ArcGIS ShapefileESRI ArcGIS 9.xNo compression appliedhttp://dx.doi.org/10.14509/2549CD-ROMJolietDigital files on CD-ROM are available for $10.00 (contact information below). No fees charged for downloaded files.Order by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). The DGGS web site (http://www.dggs.alaska.gov/) has a list of electronic data available and an order form that can be printed. Payment accepted: Cash, check, money order, VISA, or MasterCard.Digital downloads: less than 30 minutes for most files. Offline CD/DVD-ROMs: 1-2 weeks unless special arrangements are made and an express fee is paid.Please check the MapInfo web site (http://www.mapinfo.com/) for the latest documentation on importing ESRI shape files.200805062008050620100506State of Alaska, Department of Natural Resources, Division of Geological & Geophysical SurveysMetadata Managermailing and physical address3354 College RoadFairbanksAK99709-3707USA907-451-5039907-451-5050dggspubs@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidays.Please contact us through the e-mail address above whenever possible.FGDC Content Standard for Digital Geospatial MetadataFGDC-STD-001-1998noneIf the user has modified the data in any way they are obligated to describe the types of modifications they have performed in the supporting metadata file. User specifically agrees not to imply that changes they made were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys.